This seems like it should be a good basic system. I use CC Suite.
CyberPowerPC Workstation PC - 4th Gen. Intel Core i7-4770K 3.50GHz, 16GB DDR3, 2TB HDD, DVDRW, 2GB NVIDIA Quadro K2000, Windows 7 Professional 64-bit - ACCLAIMT100
I would need to add more hard drives and monitors. I could double the RAM in the near future. I plan to edit video with two tracks of video, titles, basic transitions, Some scaling and speed corrections, narration, music and minor color grading as needed.
This one might be a better choice. Adds SSD and media reader.
That system would be fine with a 750Ti or 760GTX card.